<template>
  <div class="app-container">
    <el-button @click="getFresh">默认按钮</el-button>
    <el-table
      v-loading="listLoading"
      :data="list"
      element-loading-text="Loading"
      border
      fit
      highlight-current-row>
      <el-table-column align="center" label="ID" width="95">
        <template slot-scope="scope">
          {{ scope.$index }}
        </template>
      </el-table-column>
      <el-table-column label="Title">
        <template slot-scope="scope">
          {{ scope.row.title }}
        </template>
      </el-table-column>
      <el-table-column label="Author" width="110" align="center">
        <template slot-scope="scope">
          <span>{{ scope.row.author }}</span>
        </template>
      </el-table-column>
      <el-table-column label="Pageviews" width="110" align="center">
        <template slot-scope="scope">
          {{ scope.row.pageviews }}
        </template>
      </el-table-column>
      <el-table-column class-name="status-col" label="Status" width="110" align="center">
        <template slot-scope="scope">
          <el-tag :type="scope.row.status | statusFilter">{{ scope.row.status }}</el-tag>
        </template>
      </el-table-column>
      <el-table-column align="center" prop="created_at" label="Display_time" width="200">
        <template slot-scope="scope">
          <i class="el-icon-time"/>
          <span>{{ scope.row.display_time }}</span>
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
  import { getList } from '@/api/table'

  export default {
    filters: {
      statusFilter(status) {
        const statusMap = {
          published: 'success',
          draft: 'gray',
          deleted: 'danger'
        }
        return statusMap[status]
      }
    },
    data() {
      return {
        list: null,
        listLoading: true
      }
    },
    created() {
      this.fetchData()
    },
    methods: {
      fetchData() {
        this.listLoading = true
        getList(this.listQuery).then(response => {
          this.list = response.data.items
          this.listLoading = false
        })
      },
      getFresh() {
        var websocket = null    //判断当前浏览器是否支持WebSocket
        if ('WebSocket' in window) {
          websocket = new WebSocket('ws://localhost:8080/websocket')
        } else {
          alert('当前浏览器 Not support websocket')
        }    //连接发生错误的回调方法
        websocket.onerror = function() {
          setMessageInnerHTML('WebSocket连接发生错误')
        }    //连接成功建立的回调方法
        websocket.onopen = function() {
          setMessageInnerHTML('WebSocket连接成功')
        }    //接收到消息的回调方法
        websocket.onmessage = function(event) {
          setMessageInnerHTML(event.data)
        }    //连接关闭的回调方法
        websocket.onclose = function() {
          setMessageInnerHTML('WebSocket连接关闭')
        }    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
        window.onbeforeunload = function() {
          closeWebSocket()
        }    //将消息显示在网页上
        function setMessageInnerHTML(innerHTML) {
          document.getElementById('message').innerHTML += innerHTML + '<br/>'
        }    //关闭WebSocket连接
        function closeWebSocket() {
          websocket.close()
        }    //发送消息
        function send() {
          var message = document.getElementById('text').value
          websocket.send(message)
        }
      }
    }
  }
</script>
